JPH0724860A - Drilled roll and calender - Google Patents

Abstract

PURPOSE:To obtain a drilled roll excellent in temp. distribution and thermal response at the time of heating and cooling by forming the cross section of each of a large number of the liquid heating medium circulating passages provided in the vicinity of the surface of a roll in parallel to the axial direction of the roll into a shape having a large number of radial grooves. CONSTITUTION:The cross section of each of liquid heating medium circulating passages 2 is entirely formed of a smooth curved line and provided with a large number of radial groove parts 3a and protruding parts 3b. These groove parts 3a can be formed by applying rough processing to a lower hole and performing cutting processing along the lower hole by a brouch or performing finish processing by discharge processing. By this constitution, the heat transfer area of the passage is increased as compared with that of a conventional simple circular passage and the temp. distribution and thermal response thereof are improved. The cross section of the circulating passage 2 may be made non- circular and a large number of radial grooves 3a may be formed to the passages 2. The radial grooves 3a may be spirally formed to the inner surface of the circulating passage 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a calender for processing a polymer material such as rubber or plastic, a drilled roll used in a roll machine or the like requiring roll temperature control, and a calender using the same.

[0002]

2. Description of the Related Art There is a drilled roll as a roll used in a calender that processes a polymer material such as rubber or plastic, or a roll machine that requires roll temperature control.
Conventionally, this drilled roll is provided with a heat medium liquid circulation passage having a simple circular cross section punched by a deep hole punching machine or the like under the roll surface, and the heat medium liquid supplied from the roll temperature control device ( Hereinafter, referred to as a fluid) is supplied to the heat medium liquid passage through an inner pipe near the axis. And
Heat is transferred to and from the material on the drilled roll surface, and thereafter, the fluid is collected in the outer portion (center hole) of the inner tube and returned to the roll temperature control device. The circulation of this fluid is performed by a circulation pump. In many cases, the heat medium liquid passages are provided in multiples of 3, and a triple pass system is adopted in which the adjacent heat medium liquid passages are folded back and reciprocated 1.5 times in the roll axis direction. In the above configuration, the fluid can be circulated in the passage at a high speed of about 1.5 m / min without staying, and the distance to the material is short, so that heat can be transferred satisfactorily. In addition, the temperature of the fluid decreases to some extent as it flows downstream in the heat medium liquid passages, but the adjacent heat medium liquid passages are folded back and forth to make 1.5 reciprocating movements in the roll axis direction. Transfer of heat is performed to some extent between the medium liquid passages, and the temperature drop of the fluid is compensated to some extent. Therefore, the temperature distribution in the roll axis direction becomes substantially uniform. Due to the above, in the above-mentioned drilled roll,
The uniformity of the temperature distribution of the roll and the thermal response during heating and cooling, which are essential conditions for the calender, were good.

On the other hand, as described in JP-A-2-47387 and JP-A-2-99686, a spiral heating medium liquid passage is provided near the surface of the roll, and a fluid is supplied to this passage. Circulators have been developed. This is because the spiral groove is provided in advance on the outer circumference of the inner cylinder part of the roll, and the outer cylinder part of the roll is fitted into this to form the spiral groove as the heat medium liquid passage. The cross section of the heat medium liquid passage is substantially rectangular.

[0004]

In recent years, in order to improve productivity and save energy, even in calendars, in consideration of high-speed precision, diversification of new materials, and compatibility with small lots and a wide variety of products, New technical requirements are rapidly increasing beyond the capabilities of conventional drilled rolls. In particular, the heat-related performance of drilled rolls, that is, the improvement of thermal efficiency, has become an extremely important issue. In the conventional drilled roll, the cross section of the heat medium liquid passage is a simple circle. Therefore, when trying to achieve the above, the flow rate of the fluid is increased, the flow velocity in the passage is increased, and the amount of heat exchanged is increased. There is a need. However, an increase in the flow rate or an increase in the flow velocity may cause damage to the roll due to erosion or the like. At the same time, there is a drawback in that the power consumption of the motor also increases in the circulation pump that is constantly operated.

Further, in the rolls described in JP-A-2-47387 and JP-A-2-99686, since the heat medium liquid passage provided near the surface of the roll has a spiral shape, the above-mentioned drilled roll is used. There is no such temperature compensation, and the temperature gradually decreases as the fluid flows through the heat medium liquid passage to the downstream side, and the temperature distribution in the axial direction of the roll becomes uneven. Therefore, unlike the above-mentioned drilled roll, the uniformity of the temperature distribution of the roll, which is one of the essential conditions for the calender, is not good.

An object of the present invention is to provide a drilled roll having excellent temperature distribution and thermal responsiveness during heating and cooling, and having high thermal efficiency, and a calendar using the drilled roll.

[0007]

In order to achieve the above object, according to the present invention, a large number of heat medium liquid circulation passages are provided in the vicinity of the roll surface, the heat medium liquid circulation passages being parallel to the axial direction of the roll. There is provided a drilled roll for controlling the temperature of a roll by supplying a heat medium liquid thereto, wherein the cross section of the heat medium liquid circulation passage has a large number of radial grooves.

In order to achieve the above object, according to the present invention, a large number of heat medium liquid circulation passages parallel to the axial direction of the roll are provided in the vicinity of the roll surface, and the heat medium liquid circulation passages are provided in the heat medium liquid circulation passages. In the drilled roll for controlling the temperature of the roll by supplying the above, there is provided a drilled roll characterized in that the heat medium liquid circulation passage has a non-circular cross section.

In the above-mentioned drilled roll, preferably, the cross section of the heat medium liquid circulation passage has a large number of radial grooves.

In the drilled roll, preferably, a large number of radial grooves in the cross section of the heat medium liquid circulation passage are formed on the inner surface of the heat medium liquid circulation passage in parallel with the roll axis.

Preferably, a large number of radial grooves in the cross section of the heat medium liquid circulation passage are spirally formed on the inner surface of the heat medium liquid circulation passage.

Further, in order to achieve the above object, according to the present invention, at least a final roll is provided in a calender for molding a thermoplastic polymer material by a plurality of rolls arranged such that their axes are substantially parallel to each other. Is a drilled roll as described above.

[0013]

In the present invention constructed as described above, since the heat medium liquid circulation passage has a large number of radial grooves, it is possible to circulate the heat medium liquid circulating in a simple circular shape which has been drilled by a conventional drill or the like. The surface area of the passage, that is, the heat transfer area is expanded to about twice as large as that of the passage. Therefore, it is possible to improve the temperature distribution and the thermal response during heating and cooling without increasing the fluid flow rate or the flow velocity, and it is possible to provide a drilled roll with high thermal efficiency. .

Further, since the heat medium liquid circulation passage has a non-circular cross-sectional shape, the surface area of the passage, that is, the heat transfer area is expanded as compared with the simple circular heat medium liquid circulation passage. Further, the heat transfer area is further expanded by providing a large number of radial grooves in the heat medium liquid circulation passage having a non-circular cross section.

The radial groove is preferably formed parallel to the roll axis on the inner surface of the heat medium liquid circulation passage in consideration of easiness of processing, but the radial groove is intentionally formed in a spiral shape. The fluid passing through this passage becomes a turbulent flow accompanied by a swirling flow, and heat exchange becomes active. Therefore, it becomes possible to provide a drilled roll with higher thermal efficiency.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the drilled roll structure according to the present invention will be described with reference to FIGS.

FIG. 1 is a view showing the internal structure of the drilled roll of this embodiment. However, in FIG. 1, in consideration of symmetry, only the lower half is shown in a cross section, and the upper half is schematically shown as a fluid flow path. In FIG. 1, a fluid (heat medium liquid) supplied from a roll temperature controller (not shown) is introduced into the drilled roll 1 from a fluid inlet 9 of the rotary joint 8. Inside the drilled roll 1, center holes 10 and 11 partitioned by a seal ring 6 are provided, and the introduced fluid passes through the inner pipe 7 and enters the center hole 10 ahead of the seal ring 6. Reach Then, this fluid goes from the central hole 10 through the oblique hole 4 to the vicinity of the surface of the roll, and is supplied to one end of the heat medium liquid circulation passage 2 provided near the surface of the roll. The fluid advances from one end of the heat medium liquid circulation passage 2 to the other end in the axial direction, is supplied to one end of the adjacent heat medium liquid circulation passage 2 by the connecting pipe 13, and advances in the heat medium liquid circulation passage 2 in the axial direction. After that, it is further supplied to one end of the heat medium liquid circulation passage 2 adjacent thereto by the adjacent connecting pipe 13 and advances in the axial direction.

That is, in the present embodiment, a triple pass system is adopted in which the fluid flows 1.5 times in the axial direction of the roll through the adjacent ones of the heat medium liquid circulation passages 2 which are installed in multiples of three. The heat is exchanged with the thermoplastic polymer material 100 on the roll surface by the fluid flowing in the heat medium liquid circulation passage 2. At this time, the temperature of the fluid is lowered to some extent while flowing through the heat medium liquid passage to the downstream side, but the fluid is reciprocated 1.5 times in the roll axis direction while folding the adjacent heat medium liquid passages so that they are adjacent to each other. Transfer of heat is performed to some extent between the heat medium liquid passages,
The temperature drop of the fluid is compensated to some extent. Therefore, the temperature distribution in the roll axis direction becomes substantially uniform.

Thereafter, the fluid is collected in the central hole 11 before the seal ring 6 from the oblique hole 5 on the rotary joint side, and further returns from the fluid outlet 12 of the rotary joint 8 to the roll temperature controller. The fluid flowing in the heat medium liquid circulation passage 2 can circulate in the passage at a high speed of about 1.5 m / min without staying, and flows in a place close to the thermoplastic polymer material 100, so that heat transfer is good. is there.

Next, the sectional structure of the heat medium liquid circulation passage will be described. 2 is a view showing a cross section in the II-II direction of the heat medium liquid circulation passage of the drilled roll of FIG. 1, and FIG.
It is a sectional view of a heat carrier liquid circulation passage. As shown in FIGS. 2 and 3, in the present embodiment, the cross section of the heat medium liquid circulation passage 2 is formed by a smooth curve, and has a large number of radial grooves 3a and projections 3b. The grooves 3a and the protrusions 3b have substantially the same curvature. As described above, since the cross section of the heat medium liquid circulation passage 2 is all formed by a smooth curve, it is possible to prevent stress concentration on the passage wall surface due to some reason when the fluid is flowing.

Further, as shown in FIG. 4, the groove 3a is formed on the inner surface of the heat medium liquid circulation passage 2 in parallel with the roll axis. In this processing, first, roughing the prepared hole (drilling)
Then, a cutting process is performed along the prepared hole by a broach or the like, or a finishing process is performed by electric discharge machining or the like. Further, laser processing or the like can be used, but in addition to this, a more suitable and mass-production processing method will be developed in the future.

By making the cross section of the heat medium liquid circulation passage 2 into such a shape, the surface area of the passage, that is, the heat transfer, is provided, as compared with the conventional simple heat medium liquid circulation passage which is still drilled with a drill or the like. The area will be expanded about twice. As a result, the temperature distribution and the thermal response during heating and cooling can be improved, and the thermal efficiency is improved. In addition, the heat medium liquid circulation passage 2
Since the cross-sectional shape of each is a smooth curved line, stress concentration does not partially occur and damage can be prevented. Further, the groove portion 3a can be easily processed parallel to the roll axis, that is, linearly on the inner surface of the heat medium liquid circulation passage 2.

Therefore, the drilled roll of this embodiment is suitable for calenders such as hard PVC, which generate a large amount of heat during calendering and are sensitive to thermal characteristics. An example of a calendar to which the drilled roll of this embodiment is applied will be described below with reference to FIG.

In FIG. 5A, the rolls 21, 22,
23 and 24 are housed in a housing 50 such that their axes are substantially parallel to each other, and are respectively arranged in the pullback cylinder 21.
It is supported at a predetermined position of the housing 50 by a to 24a. The housing 50 is mounted on a sole plate 51 provided on the factory floor. The roll 21 includes a reduction device 21b including a motor 21c and a reduction screw 21d. Similarly, the roll 22 includes a reduction device 22b including a motor 22c and a reduction screw 22d, and the roll 24 includes a motor 24c and a reduction screw 24d. Each of the reduction devices 21b, 22b, and 24b adjusts the gap between the rolls, and thus the thickness of each nip. A cross device 23b is attached to the roll 23.
3 is capable of inclining its axis with respect to the original axis by a small angle. Also, the final roll, roll 24
Is the drilled roll described in FIGS. 1 to 4,
It has good temperature distribution and thermal response during heating and cooling, and high thermal efficiency. However, the final roll, that is, a roll other than the roll 24 may be the drilled roll.

FIG. 5B is a diagram schematically showing the arrangement of the rolls and the material paths in the calendar. As shown in FIG. 5 (b), this calendar is an inverted L-shaped four roll calender, and the roll 2 is provided on the side of the roll 21.
2 are arranged adjacent to each other, and a roll 23 is provided below the roll 22.
Is arranged, and the roll 24 is arranged below the roll 23 and on the side farther than the roll 22. Then, the thermoplastic polymer material 30 is supplied between the rolls 21 and 22, is wound around the roll 22 through the gap between the rolls 21 and 22, passes through the gap between the rolls 22 and 23, and passes through the roll 2
3 is wrapped around the roll 3, passes through the gap between the roll 23 and the roll 24, is wrapped around the roll 24, and finally peeled off from the roll 24 to obtain a product.

By the way, among the thermoplastic polymer materials,
Olefin-based resins have few odors and defects in physical properties,
In recent years, the demand for foods, pharmaceuticals, cosmetics, and the like has increased remarkably. When this olefin resin is processed by a conventional calender, temperature conditions are severe, and it may be sticky during processing, which may hinder operation, and there is a concern that the mobility may decrease. However, since the strict heat control can be performed by the calendar using the drilled roll of the present embodiment, even an olefin resin can be easily produced and the operation rate is improved. Further, it is possible to achieve high-speed precision of the calendar and diversification to new materials and the like, and it is possible to swiftly respond to the switching operation of the manufacturing conditions when manufacturing a wide variety of products in a small lot.

FIG. 6 shows a modification of this embodiment. FIG. 6 shows a cross section of the heat medium liquid circulation passage 2A, but the cross-sectional shapes of a large number of radial grooves 3a and projections 3b are slightly different from the drawing, and the curvature of the groove 3c is larger than the curvature of the projection 3d. However,
The cross section of the heat medium liquid circulation passage 2A is also entirely formed by a smooth curve, so that stress concentration does not occur locally and damage can be prevented.

As described above, according to this embodiment, the surface area of the heat medium liquid circulation passage 2, that is, the heat transfer area is enlarged, and the flow rate of the fluid flowing through the heat medium liquid circulation passage 2 is not increased or the flow velocity is not increased. The temperature distribution and the thermal response during heating and cooling can be improved, and the thermal efficiency can be improved.

Further, since it is not necessary to increase the flow rate or the flow velocity of the fluid in order to increase the amount of heat exchanged, there is no risk of roll damage due to erosion or the like, and a motor for a circulation pump required for each roll. The power consumption can be saved and the energy saving effect is great.

Another embodiment of the drilled roll structure according to the present invention will be described with reference to FIG. In the drilled roll of this embodiment, the cross section of the heat medium liquid circulation passage 2B is the same as that of FIG. 3 or 6, but the groove 3a is spirally formed on the inner surface of the heat medium liquid circulation passage 2B as shown in FIG. ing. The configuration other than this is the same as that of the above-described embodiment. The fluid passing through such a spiral heat medium liquid circulation passage 2B becomes a turbulent flow accompanied by a swirling flow, and heat exchange becomes active.

According to the present embodiment as described above, not only the same effects as the above-mentioned embodiments can be obtained, but also the heat exchange by the fluid becomes active, so that the thermal efficiency is further improved.

Still another embodiment of the drilled roll structure according to the present invention will be described with reference to FIG. In the drilled roll of this embodiment, the cross-sectional shape of the heat medium liquid circulation passage 2C is elliptical (non-circular), unlike the cases of FIGS. 3 and 6, in which a large number of radial grooves are not provided. The configuration other than this is the same as that of the above-described embodiment. Since the cross-sectional shape of the heat medium liquid circulation passage 2C is elliptical (non-circular) as described above, the surface area of the passage, that is, the heat transfer area, is larger than that of the simple circular heat medium liquid circulation passage.

Therefore, also in this embodiment, the surface area of the heat medium liquid circulation passage 2C, that is, the heat transfer area is expanded, and the temperature distribution and the heating are performed without increasing the flow rate or the flow velocity of the fluid flowing therethrough. The thermal response at the time of cooling can be improved, and the thermal efficiency can be improved.

The cross section of the heat medium liquid circulation passage may not have an elliptical shape as described above, but may have another non-circular shape such as a polygonal shape.

[0035]

According to the present invention, the surface area of the passage, that is, the heat transfer area, can be increased as compared with the conventional simple circular heat medium liquid circulation passage, and the fluid flow rate and the flow velocity can be increased. It is possible to improve the temperature distribution and the thermal responsiveness at the time of heating / cooling without causing any trouble. Therefore, a drilled roll with high thermal efficiency can be provided.

Further, since it is not necessary to increase the flow rate or the flow velocity of the fluid, there is no risk of causing roll damage due to erosion, etc., and further, the power consumption of the circulation pump motor can be saved and the energy saving effect is great.

[0037]

[Brief description of drawings]

FIG. 1 is a diagram showing an internal structure of a drilled roll according to an embodiment of the present invention.

FIG. 2 is a view showing a cross section in the direction II-II of the drilled roll of FIG.

FIG. 3 is a cross-sectional view of a heat medium liquid circulation passage in the drilled roll of FIG.

FIG. 4 is a diagram showing an inner surface of a heat medium liquid circulation passage of FIG. 3;

5 (a) is a diagram showing an example of a calendar to which the drilled roll of FIG. 1 is applied, and FIG. 5 (b) is a diagram schematically showing the arrangement of rolls and material paths in the calendar of FIG. Is.

6 is a cross-sectional view showing a modified example of the heat medium liquid circulation passage of FIG.

FIG. 7 is a view showing an inner surface of a heat medium liquid circulation passage in a drilled roll according to another embodiment of the present invention.

FIG. 8 is a diagram showing a radial cross section of a drilled roll according to still another embodiment of the present invention.

[Explanation of symbols]

 1 Drilled Roll 2 Heat Medium Liquid Circulation Passage 3a (Heat Medium Liquid Circulation Passage) Groove 3b (Heat Medium Liquid Circulation Passage) Projection 4,5 Diagonal Hole 6 Seal Ring 7 Inner Tube 8 Rotating Joint 9 Fluid Inlet 10, 11 Central hole 12 Fluid outlet 13 Connection hole 21-24 Roll 30 Thermoplastic polymer material 100 Thermoplastic polymer material

Claims (6)

[Claims] 1. A drilled roll in which a large number of heat medium liquid circulation passages parallel to the axial direction of the roll are provided in the vicinity of the roll surface, and the temperature of the roll is controlled by supplying the heat medium liquid circulation passage to the heat medium liquid circulation passages. The drilled roll according to claim 1, wherein a cross section of the heat medium liquid circulation passage has a large number of radial grooves. 2. A drilled roll in which a large number of heat medium liquid circulation passages parallel to the axial direction of the roll are provided in the vicinity of the roll surface, and the heat medium liquid is supplied to the heat medium liquid circulation passages to control the temperature of the roll. 2. The drilled roll according to claim 1, wherein the heat medium liquid circulation passage has a non-circular cross section. 3. The drilled roll according to claim 2, wherein a cross section of the heat medium liquid circulation passage has a large number of radial grooves. 4. The drilled roll according to claim 1, wherein a large number of radial grooves in the cross section of the heat medium liquid circulation passage are formed on the inner surface of the heat medium liquid circulation passage in parallel with the roll axis. The featured drilled roll. 5. The drilled roll according to claim 1, wherein a large number of radial grooves in the cross section of the heat medium liquid circulation passage are spirally formed on the inner surface of the heat medium liquid circulation passage. Drilled rolls. 6. A calender for molding a thermoplastic polymer material by a plurality of rolls arranged such that their axes are substantially parallel to each other, wherein at least the final roll is one of claims 1 to 5. A calendar characterized by being a drilled roll.